var util = {};
/**
	构造微擎地址, 
	@params action 微擎系统中的controller, action, do，格式为 'wxapp/home/navs'
	@params querystring 格式为 {参数名1 : 值1, 参数名2 : 值2}
*/
util.url = function (action, querystring) {
	var app = getApp();
	var url = app.siteInfo.siteroot + '?i=' + app.siteInfo.uniacid + '&t=' + app.siteInfo.multiid + '&v=' + app.siteInfo.version + '&from=wxapp&';

	if (action) {
		action = action.split('/');
		if (action[0]) {
			url += 'c=' + action[0] + '&';
		}
		if (action[1]) {
			url += 'a=' + action[1] + '&';
		}
		if (action[2]) {
			url += 'do=' + action[2] + '&';
		}
	}
	if (querystring && typeof querystring === 'object') {
		for (let param in querystring) {
            if (param && querystring.hasOwnProperty(params) && querystring[param]) {
				url += param + '=' + querystring[param] + '&';
			}
		}
	}
	return url;
}

function getQuery(url) {
	var theRequest = [];
	if (url.indexOf("?") != -1) {
		var str = url.split('?')[1];
		var strs = str.split("&");
		for (var i = 0; i < strs.length; i++) {
			if (strs[i].split("=")[0] && unescape(strs[i].split("=")[1])) {
				theRequest[i] = {
					'name': strs[i].split("=")[0],
					'value': unescape(strs[i].split("=")[1])
				}
			}
		}
	}
	return theRequest;
}
/*
* 获取链接某个参数
* url 链接地址
* name 参数名称
*/
function getUrlParam(url, name) {
	var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象  
	var r = url.split('?')[1].match(reg);  //匹配目标参数  
	if (r != null) return unescape(r[2]); return null; //返回参数值  
}
/**
 * 获取签名 将链接地址的所有参数按字母排序后拼接加上token进行md5
 * url 链接地址
 * date 参数{参数名1 : 值1, 参数名2 : 值2} *
 * token 签名token 非必须
 */
function getSign(url, data, token) {
	var _ = require('underscore.js');
	var md5 = require('md5.js');
	var querystring = '';
	var sign = getUrlParam(url, 'sign');
	if (sign || (data && data.sign)) {
		return false;
	} else {
		if (url) {
			querystring = getQuery(url);
		}
		if (data) {
			var theRequest = [];
			for (let param in data) {
				if (param && data[param]) {
					theRequest = theRequest.concat({
						'name': param,
						'value': data[param]
					})
				}
			}
			querystring = querystring.concat(theRequest);
		}
		//排序
		querystring = _.sortBy(querystring, 'name');
		//去重
		querystring = _.uniq(querystring, true, 'name');
		var urlData = '';
		for (let i = 0; i < querystring.length; i++) {
			if (querystring[i] && querystring[i].name && querystring[i].value) {
				urlData += querystring[i].name + '=' + querystring[i].value;
				if (i < (querystring.length - 1)) {
					urlData += '&';
				}
			}
		}
		token = token ? token : getApp().siteInfo.token;
		sign = md5(urlData + token);
		return sign;
	}
}
/**
	二次封装微信wx.request函数、增加交互体全、配置缓存、以及配合微擎格式化返回数据

	@params option 弹出参数表，
	{
		url : 同微信,
		data : 同微信,
		header : 同微信,
		method : 同微信,
		success : 同微信,
		fail : 同微信,
		complete : 同微信,

		cachetime : 缓存周期，在此周期内不重复请求http，默认不缓存
	}
*/
util.request = function (option) {
	var _ = require('underscore.js');
	var md5 = require('md5.js');
	var app = getApp();
	var option = option ? option : {};
	option.cachetime = option.cachetime ? option.cachetime : 0;
	option.showLoading = typeof option.showLoading != 'undefined' ? option.showLoading : true;

	var sessionid = wx.getStorageSync('userInfo').sessionid;
	var url = option.url;
	if (url.indexOf('http://') == -1 && url.indexOf('https://') == -1) {
		url = util.url(url);
	}
	var state = getUrlParam(url, 'state');
	if (!state && !(option.data && option.data.state) && sessionid) {
		url = url + '&state=we7sid-' + sessionid
	}
	if (!option.data || !option.data.m) {
		var nowPage = getCurrentPages();
   
		if (nowPage.length) {
			nowPage = nowPage[getCurrentPages().length - 1];
      if (nowPage && nowPage.__route__) {
				url = url + '&m=' + nowPage.__route__.split('/')[0];
			}
		}
	}

	var sign = getSign(url, option.data);
	if (sign) {
		url = url + "&sign=" + sign;
	}
	if (!url) {
		return false;
	}
	wx.showNavigationBarLoading();
	if (option.showLoading) {
		util.showLoading();
	}
	if (option.cachetime) {
		var cachekey = md5(url);
		var cachedata = wx.getStorageSync(cachekey);
		var timestamp = Date.parse(new Date());

		if (cachedata && cachedata.data) {
			if (cachedata.expire > timestamp) {
				if (option.complete && typeof option.complete == 'function') {
					option.complete(cachedata);
				}
				if (option.success && typeof option.success == 'function') {
					option.success(cachedata);
				}
				console.log('cache:' + url);
				wx.hideLoading();
				wx.hideNavigationBarLoading();
				return true;
			} else {
				wx.removeStorageSync(cachekey)
			}
		}
	}
	wx.request({
		'url': url,
		'data': option.data ? option.data : {},
		'header': option.header ? option.header : {},
		'method': option.method ? option.method : 'GET',
		'header': {
			'content-type': 'application/x-www-form-urlencoded'
		},
		'success': function (response) {
			wx.hideNavigationBarLoading();
			wx.hideLoading();
			if (response.data.errno) {
				if (response.data.errno == '41009') {
					wx.setStorageSync('userInfo', '');
					util.getUserInfo(function () {
						util.request(option)
					});
					return;
				} else {
					if (option.fail && typeof option.fail == 'function') {
						option.fail(response);
					} else {
						if (response.data.message) {
							if (response.data.data != null && response.data.data.redirect) {
								var redirect = response.data.data.redirect;
							} else {
								var redirect = '';
							}
							app.util.message(response.data.message, redirect, 'error');
						}
					}
					return;
				}
            } else {
				if (option.success && typeof option.success == 'function') {
					option.success(response);
				}
				//写入缓存，减少HTTP请求，并且如果网络异常可以读取缓存数据
				if (option.cachetime) {
					var cachedata = { 'data': response.data, 'expire': timestamp + option.cachetime * 1000 };
					wx.setStorageSync(cachekey, cachedata);
				}
			}
		},
		'fail': function (response) {
			wx.hideNavigationBarLoading();
			wx.hideLoading();
			
			//如果请求失败，尝试从缓存中读取数据
			var md5 = require('md5.js');
			var cachekey = md5(url);
			var cachedata = wx.getStorageSync(cachekey);
			if (cachedata && cachedata.data) {
				if (option.success && typeof option.success == 'function') {
					option.success(cachedata);
				}
				console.log('failreadcache:' + url);
				return true;
			} else {
				if (option.fail && typeof option.fail == 'function') {
					option.fail(response);
				}
			}
		},
		'complete': function (response) {
			// wx.hideNavigationBarLoading();
			// wx.hideLoading();
			if (option.complete && typeof option.complete == 'function') {
				option.complete(response);
			}
		}
	});
}
/*
* 获取用户信息
*/
util.getUserInfo = function (cb) {
	var login = function() {
		console.log('start login');
		var userInfo = {
			'sessionid': '',
			'wxInfo': '',
			'memberInfo': '',
		};
		wx.login({
			success: function (res) {
				util.request({
					url: 'auth/session/openid',
					data: { code: res.code },
					cachetime: 0,
					success: function (session) {
						if (!session.data.errno) {
							userInfo.sessionid = session.data.data.sessionid
							wx.setStorageSync('userInfo', userInfo);
							wx.getUserInfo({
								success: function (wxInfo) {
									userInfo.wxInfo = wxInfo.userInfo
									wx.setStorageSync('userInfo', userInfo);
									util.request({
										url: 'auth/session/userinfo',
										data: {
											signature: wxInfo.signature,
											rawData: wxInfo.rawData,
											iv: wxInfo.iv,
											encryptedData: wxInfo.encryptedData
										},
										method: 'POST',
										header: {
											'content-type': 'application/x-www-form-urlencoded'
										},
										cachetime: 0,
										success: function (res) {
											if (!res.data.errno) {
												userInfo.memberInfo = res.data.data;
												wx.setStorageSync('userInfo', userInfo);
											}
											typeof cb == "function" && cb(userInfo);
										}
									});
								},
								fail: function () {
								},
								complete: function () {
								}
							})
						}
					}
				});
			},
			fail: function () {
				wx.showModal({
					title: '获取信息失败',
					content: '请允许授权以便为您提供给服务',
					success: function (res) {
						if (res.confirm) {
							util.getUserInfo();
						}
					}
				})
			}
		});
	};

	var app = wx.getStorageSync('userInfo');
	if (app.sessionid) {
		wx.checkSession({
			success: function(){
				typeof cb == "function" && cb(app);
			},
			fail: function(){
				app.sessionid = '';
				console.log('relogin');
				wx.removeStorageSync('userInfo');
				login();
			}
		})
	} else {
		//调用登录接口
		login();
	}
}

util.navigateBack = function (obj) {
	let delta = obj.delta ? obj.delta : 1;
	if (obj.data) {
		let pages = getCurrentPages()
		let curPage = pages[pages.length - (delta + 1)];
		if (curPage.pageForResult) {
			curPage.pageForResult(obj.data);
		} else {
			curPage.setData(obj.data);
		}
	}
	wx.navigateBack({
		delta: delta, // 回退前 delta(默认为1) 页面
		success: function (res) {
			// success
			typeof obj.success == "function" && obj.success(res);
		},
		fail: function (err) {
			// fail
			typeof obj.fail == "function" && obj.function(err);
		},
		complete: function () {
			// complete
			typeof obj.complete == "function" && obj.complete();
		}
	})
};

util.footer = function ($this) {
	let app = getApp();
	let that = $this;
	let tabBar = app.tabBar;
	for (let i in tabBar['list']) {
		tabBar['list'][i]['pageUrl'] = tabBar['list'][i]['pagePath'].replace(/(\?|#)[^"]*/g, '')
	}
	that.setData({
		tabBar: tabBar,
		'tabBar.thisurl': that.__route__
	})
};
/*
 * 提示信息
 * type 为 success, error 当为 success,  时，为toast方式，否则为模态框的方式
 * redirect 为提示后的跳转地址, 跳转的时候可以加上 协议名称  
 * navigate:/we7/pages/detail/detail 以 navigateTo 的方法跳转，
 * redirect:/we7/pages/detail/detail 以 redirectTo 的方式跳转，默认为 redirect
*/
util.message = function(title, redirect, type) {
	if (!title) {
		return true;
	}
	if (typeof title == 'object') {
		redirect = title.redirect;
		type = title.type;
		title = title.title;
	}
	if (redirect) {
		var redirectType = redirect.substring(0, 9), url = '', redirectFunction = '';
		if (redirectType == 'navigate:') {
			redirectFunction = 'navigateTo';
			url = redirect.substring(9);
		} else if (redirectType == 'redirect:') {
			redirectFunction = 'redirectTo';
			url = redirect.substring(9);
		} else {
			url = redirect;
			redirectFunction = 'redirectTo';
		}
	}

	if (!type) {
		type = 'success';
	}

	if (type == 'success') {
		wx.showToast({
			title: title,
			icon: 'success',
			duration: 2000,
			mask : url ? true : false,
			complete : function() {
				if (url) {
					setTimeout(function(){
						wx[redirectFunction]({
							url: url,
						});
					}, 1800);
				}
				
			}
		});
	} else if (type == 'error') {
		wx.showModal({
			title: '系统信息',
			content : title,
			showCancel : false,
			complete : function() {
				if (url) {
					wx[redirectFunction]({
						url: url,
					});
				}
			}
		});
	}
}

util.user = util.getUserInfo;

//封装微信等待提示，防止ajax过多时，show多次
util.showLoading = function() {
	var isShowLoading = wx.getStorageSync('isShowLoading');
	if (isShowLoading) {
		wx.hideLoading();
		wx.setStorageSync('isShowLoading', false);
	}

	wx.showLoading({
		title : '加载中',
		complete : function() {
			wx.setStorageSync('isShowLoading', true);
		},
		fail : function() {
			wx.setStorageSync('isShowLoading', false);
		}
	});
}

util.showImage = function(event) {
	var url = event ? event.currentTarget.dataset.preview : '';
	if (!url) {
		return false;
	}
	wx.previewImage({
		urls: [url]
	});
}

/**
 * 转换内容中的emoji表情为 unicode 码点，在Php中使用utf8_bytes来转换输出
*/
util.parseContent = function(string) {
	if (!string) {
		return string;
	}

	var ranges = [
			'\ud83c[\udf00-\udfff]', // U+1F300 to U+1F3FF
			'\ud83d[\udc00-\ude4f]', // U+1F400 to U+1F64F
			'\ud83d[\ude80-\udeff]'  // U+1F680 to U+1F6FF
		];
	var emoji = string.match(
		new RegExp(ranges.join('|'), 'g'));

	if (emoji) {
		for (var i in emoji) {
			string = string.replace(emoji[i], '[U+' + emoji[i].codePointAt(0).toString(16).toUpperCase() + ']');
		}
	}
	return string;
}

util.date = function(){
	/**
	 * 判断闰年
	 * @param date Date日期对象
	 * @return boolean true 或false
	 */
	this.isLeapYear = function(date){
		return (0==date.getYear()%4&&((date.getYear()%100!=0)||(date.getYear()%400==0))); 
	}
	
	/**
	 * 日期对象转换为指定格式的字符串
	 * @param f 日期格式,格式定义如下 yyyy-MM-dd HH:mm:ss
	 * @param date Date日期对象, 如果缺省，则为当前时间
	 *
	 * YYYY/yyyy/YY/yy 表示年份  
	 * MM/M 月份  
	 * W/w 星期  
	 * dd/DD/d/D 日期  
	 * hh/HH/h/H 时间  
	 * mm/m 分钟  
	 * ss/SS/s/S 秒  
	 * @return string 指定格式的时间字符串
	 */
	this.dateToStr = function(formatStr, date){
		formatStr = arguments[0] || "yyyy-MM-dd HH:mm:ss";
		date = arguments[1] || new Date();
		var str = formatStr;   
		var Week = ['日','一','二','三','四','五','六'];  
		str=str.replace(/yyyy|YYYY/,date.getFullYear());   
		str=str.replace(/yy|YY/,(date.getYear() % 100)>9?(date.getYear() % 100).toString():'0' + (date.getYear() % 100));   
		str=str.replace(/MM/,date.getMonth()>9?(date.getMonth() + 1):'0' + (date.getMonth() + 1));   
		str=str.replace(/M/g,date.getMonth());   
		str=str.replace(/w|W/g,Week[date.getDay()]);   
	  
		str=str.replace(/dd|DD/,date.getDate()>9?date.getDate().toString():'0' + date.getDate());   
		str=str.replace(/d|D/g,date.getDate());   
	  
		str=str.replace(/hh|HH/,date.getHours()>9?date.getHours().toString():'0' + date.getHours());   
		str=str.replace(/h|H/g,date.getHours());   
		str=str.replace(/mm/,date.getMinutes()>9?date.getMinutes().toString():'0' + date.getMinutes());   
		str=str.replace(/m/g,date.getMinutes());   
	  
		str=str.replace(/ss|SS/,date.getSeconds()>9?date.getSeconds().toString():'0' + date.getSeconds());   
		str=str.replace(/s|S/g,date.getSeconds());   
	  
		return str;   
	}
 
	
	/**
	* 日期计算  
	* @param strInterval string  可选值 y 年 m月 d日 w星期 ww周 h时 n分 s秒  
	* @param num int
	* @param date Date 日期对象
	* @return Date 返回日期对象
	*/
	this.dateAdd = function(strInterval, num, date){
		date =  arguments[2] || new Date();
		switch (strInterval) { 
			case 's' :return new Date(date.getTime() + (1000 * num));  
			case 'n' :return new Date(date.getTime() + (60000 * num));  
			case 'h' :return new Date(date.getTime() + (3600000 * num));  
			case 'd' :return new Date(date.getTime() + (86400000 * num));  
			case 'w' :return new Date(date.getTime() + ((86400000 * 7) * num));  
			case 'm' :return new Date(date.getFullYear(), (date.getMonth()) + num, date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds());  
			case 'y' :return new Date((date.getFullYear() + num), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds());  
		}  
	}  
	
	/**
	* 比较日期差 dtEnd 格式为日期型或者有效日期格式字符串
	* @param strInterval string  可选值 y 年 m月 d日 w星期 ww周 h时 n分 s秒  
	* @param dtStart Date  可选值 y 年 m月 d日 w星期 ww周 h时 n分 s秒
	* @param dtEnd Date  可选值 y 年 m月 d日 w星期 ww周 h时 n分 s秒 
	*/
	this.dateDiff = function(strInterval, dtStart, dtEnd) {   
		switch (strInterval) {   
			case 's' :return parseInt((dtEnd - dtStart) / 1000);  
			case 'n' :return parseInt((dtEnd - dtStart) / 60000);  
			case 'h' :return parseInt((dtEnd - dtStart) / 3600000);  
			case 'd' :return parseInt((dtEnd - dtStart) / 86400000);  
			case 'w' :return parseInt((dtEnd - dtStart) / (86400000 * 7));  
			case 'm' :return (dtEnd.getMonth()+1)+((dtEnd.getFullYear()-dtStart.getFullYear())*12) - (dtStart.getMonth()+1);  
			case 'y' :return dtEnd.getFullYear() - dtStart.getFullYear();  
		}  
	}
 
	/**
	* 字符串转换为日期对象
	* @param date Date 格式为yyyy-MM-dd HH:mm:ss，必须按年月日时分秒的顺序，中间分隔符不限制
	*/
	this.strToDate = function(dateStr){
		var data = dateStr;  
		var reCat = /(\d{1,4})/gm;   
		var t = data.match(reCat);
		t[1] = t[1] - 1;
		eval('var d = new Date('+t.join(',')+');');
		return d;
	}
 
	/**
	* 把指定格式的字符串转换为日期对象yyyy-MM-dd HH:mm:ss
	* 
	*/
	this.strFormatToDate = function(formatStr, dateStr){
		var year = 0;
		var start = -1;
		var len = dateStr.length;
		if((start = formatStr.indexOf('yyyy')) > -1 && start < len){
			year = dateStr.substr(start, 4);
		}
		var month = 0;
		if((start = formatStr.indexOf('MM')) > -1  && start < len){
			month = parseInt(dateStr.substr(start, 2)) - 1;
		}
		var day = 0;
		if((start = formatStr.indexOf('dd')) > -1 && start < len){
			day = parseInt(dateStr.substr(start, 2));
		}
		var hour = 0;
		if( ((start = formatStr.indexOf('HH')) > -1 || (start = formatStr.indexOf('hh')) > 1) && start < len){
			hour = parseInt(dateStr.substr(start, 2));
		}
		var minute = 0;
		if((start = formatStr.indexOf('mm')) > -1  && start < len){
			minute = dateStr.substr(start, 2);
		}
		var second = 0;
		if((start = formatStr.indexOf('ss')) > -1  && start < len){
			second = dateStr.substr(start, 2);
		}
		return new Date(year, month, day, hour, minute, second);
	}
 
 
	/**
	* 日期对象转换为毫秒数
	*/
	this.dateToLong = function(date){
		return date.getTime();
	}
 
	/**
	* 毫秒转换为日期对象
	* @param dateVal number 日期的毫秒数 
	*/
	this.longToDate = function(dateVal){
		return new Date(dateVal);
	}
 
	/**
	* 判断字符串是否为日期格式
	* @param str string 字符串
	* @param formatStr string 日期格式， 如下 yyyy-MM-dd
	*/
	this.isDate = function(str, formatStr){
		if (formatStr == null){
			formatStr = "yyyyMMdd";	
		}
		var yIndex = formatStr.indexOf("yyyy");	 
		if(yIndex==-1){
			return false;
		}
		var year = str.substring(yIndex,yIndex+4);	 
		var mIndex = formatStr.indexOf("MM");	 
		if(mIndex==-1){
			return false;
		}
		var month = str.substring(mIndex,mIndex+2);	 
		var dIndex = formatStr.indexOf("dd");	 
		if(dIndex==-1){
			return false;
		}
		var day = str.substring(dIndex,dIndex+2);	 
		if(!isNumber(year)||year>"2100" || year< "1900"){
			return false;
		}
		if(!isNumber(month)||month>"12" || month< "01"){
			return false;
		}
		if(day>getMaxDay(year,month) || day< "01"){
			return false;
		}
		return true;   
	}
	
	this.getMaxDay = function(year,month) {	 
		if(month==4||month==6||month==9||month==11)	 
			return "30";	 
		if(month==2)	 
			if(year%4==0&&year%100!=0 || year%400==0)	 
				return "29";	 
			else	 
				return "28";	 
		return "31";	 
	}	 
	/**
	*	变量是否为数字
	*/
	this.isNumber = function(str)
	{
		var regExp = /^\d+$/g;
		return regExp.test(str);
	}
	
	/**
	* 把日期分割成数组 [年、月、日、时、分、秒]
	*/
	this.toArray = function(myDate)  
	{   
		myDate = arguments[0] || new Date();
		var myArray = Array();  
		myArray[0] = myDate.getFullYear();  
		myArray[1] = myDate.getMonth();  
		myArray[2] = myDate.getDate();  
		myArray[3] = myDate.getHours();  
		myArray[4] = myDate.getMinutes();  
		myArray[5] = myDate.getSeconds();  
		return myArray;  
	}  
	
	/**
	* 取得日期数据信息  
	* 参数 interval 表示数据类型  
	* y 年 M月 d日 w星期 ww周 h时 n分 s秒  
	*/
	this.datePart = function(interval, myDate)  
	{   
		myDate = arguments[1] || new Date();
		var partStr='';  
		var Week = ['日','一','二','三','四','五','六'];  
		switch (interval)  
		{   
			case 'y' :partStr = myDate.getFullYear();break;  
			case 'M' :partStr = myDate.getMonth()+1;break;  
			case 'd' :partStr = myDate.getDate();break;  
			case 'w' :partStr = Week[myDate.getDay()];break;  
			case 'ww' :partStr = myDate.WeekNumOfYear();break;  
			case 'h' :partStr = myDate.getHours();break;  
			case 'm' :partStr = myDate.getMinutes();break;  
			case 's' :partStr = myDate.getSeconds();break;  
		}  
		return partStr;  
	}  
	
	/**
	* 取得当前日期所在月的最大天数  
	*/
	this.maxDayOfDate = function(date)  
	{   
		date = arguments[0] || new Date();
		date.setDate(1);
		date.setMonth(date.getMonth() + 1);
		var time = date.getTime() - 24 * 60 * 60 * 1000;
		var newDate = new Date(time);
		return newDate.getDate();
	}
};

module.exports = util;